tensorrtx/retinaface/calibrator.cpp:4:31: 致命错误：opencv2/dnn/dnn.hpp：没有那个文件或目录

如果没有文件 /usr/local/include/opencv4/opencv2/dnn/dnn.hpp

则需要安装opencv-4.1.0

（一）安装依赖

sudo yum install  gcc  gcc-c++

sudo yum install cmake3

sudo yum install gtk2-devel

sudo yum install gtk3-devel

sudo yum install ant

（二）下载源码opencv-4.1.0.zip

cd /usr/local/

unzip opencv-4.1.0.zip

cd /usr/local/opencv-4.1.0/

mkdir build

cd build

编译&安装

sudo cmake3 -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local -D INSTALL_PYTHON_EXAMPLES=ON -D INSTALL_C_EXAMPLES=OFF -D OPENCV_ENABLE_NONFREE=ON -D WITH_CUDA=ON -D WITH_CUDNN=ON -D OPENCV_DNN_CUDA=ON -DBUILD_opencv_cudacodec=OFF -D OPENCV_EXTRA_MODULES_PATH=/usr/local/opencv_contrib-4.1.0/modules/ -D ENABLE_FAST_MATH=1 -D CUDA_FAST_MATH=1 -D CUDA_ARCH_BIN=7.5 -D WITH_CUBLAS=1 -D HAVE_opencv_python3=ON -D PYTHON_EXECUTABLE=~/anaconda3/envs/face/bin/python -D BUILD_EXAMPLES=OFF -D WITH_EIGEN=ON -D WITH_V4L=ON -D WITH_NVCUVID=1 -D WITH_FFMPEG=ON -D ENABLE_AVX=ON -D WITH_IPP=ON -D WITH_TBB=ON -D WITH_OPENGL=ON -D WITH_OPENCL=ON ..

sudo make -j8

sudo make install